AU2015363518A1 - Stator segment for a hollow cylinder-shaped, segmented stator of an electrical machine - Google Patents
Stator segment for a hollow cylinder-shaped, segmented stator of an electrical machine Download PDFInfo
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- AU2015363518A1 AU2015363518A1 AU2015363518A AU2015363518A AU2015363518A1 AU 2015363518 A1 AU2015363518 A1 AU 2015363518A1 AU 2015363518 A AU2015363518 A AU 2015363518A AU 2015363518 A AU2015363518 A AU 2015363518A AU 2015363518 A1 AU2015363518 A1 AU 2015363518A1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/12—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors arranged in slots
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K3/00—Details of windings
- H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
- H02K3/28—Layout of windings or of connections between windings
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
- H02K2213/12—Machines characterised by the modularity of some components
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
- H02K7/1807—Rotary generators
- H02K7/1823—Rotary generators structurally associated with turbines or similar engines
- H02K7/183—Rotary generators structurally associated with turbines or similar engines wherein the turbine is a wind turbine
- H02K7/1838—Generators mounted in a nacelle or similar structure of a horizontal axis wind turbine
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Windings For Motors And Generators (AREA)
- Iron Core Of Rotating Electric Machines (AREA)
Abstract
The invention relates to a stator segment for a hollow cylinder-shaped, segmented stator of an electrical machine, wherein the stator segment has a segment laminated core (1) having a first edge portion (2) and a second edge portion (3), which are each arranged on a segment boundary (4) to the respective adjacent stator segment, and a central portion (5), which is arranged between the first edge portion (2) and the second edge portion (3). It is proposed that the coils comprise second coils (12), each of which surround the segment laminated core (1) and have a second groove portion (13), a back portion (14) and two radial portions (15), wherein the back portion (14) of the respective second coil (12) is arranged on the radial outer side of the segment laminated core (1), wherein the respective second groove portion (13) on the respective axial end site is connected to the back portion (14) of the respective second coil (12) by means of the respective radial portion (15), wherein the second groove portion (13) of the respective second coil (12) is arranged in one of the grooves (6) of the respective edge portion (2, 3).
Description
PCT/EP2015/077639 / 2014P20740WO 1
Description
Stator segment for a hollow cylinder-shaped, segmented stator of an electrical machine
The invention relates to a stator segment for a hollow cylinder-shaped, segmented stator of an electrical machine, wherein the stator segment has a segment laminated core having a first edge portion and a second edge portion, which are each arranged on a segment boundary to the respective adjacent stator segment, and a central portion, which is arranged between the first edge portion and the second edge portion, and coils each having at least one groove portion, wherein the segment laminated core has radially inwardly open grooves extending in the axial direction, which are arranged offset to one another in the circumferential direction, wherein the respective groove is embodied such that two groove portions can be arranged therein one on top of the other in the radial direction with the radially inwardly arranged groove portion functioning as a top bar and the radially outwardly arranged groove portion functioning as a bottom bar, wherein the coils comprise first coils which each have two first groove portions and two winding head portions, wherein the two first groove portions of the respective first coil are connected to one another on the respective axial end face by means of the respective winding head portion, wherein the two first groove portions of the respective first coil are arranged in different grooves, which are offset with respect to one another by a number of grooves, wherein in each case two first groove portions of different first coils arranged one on top of the other in the radial direction are arranged in the grooves of the central portion, wherein in each case a first
PCT/EP2015/077639 / 2014P20740WO 2 groove portion of one of the first coils is arranged in the grooves of the respective edge portion.
The invention also relates to a hollow cylinder-shaped, segmented stator for an electrical machine having at least two stator segments of this kind. The invention also relates to an electrical machine of this kind and finally a mill or a compressor having an electrical machine of this kind.
Stators or stands of electrical machines usually consist of a laminated core and a current-carrying stator winding system, described in more detail hereinafter in conjunction with Figs 1 to 3, wherein Fig 1 shows a view in the axial direction and Fig 2 a view from radially outside.
The laminated core of the stator is, particularly from a specific electric power, constructed from a plurality of segment laminated cores 31, wherein two adjacent segment laminated cores 31 abut one another at their respective segment boundaries 32. The winding is made up of a plurality of coils 33, 39 for example as indicated in Fig 1 in the form of corded two-layer windings, wherein bar windings are also used. Each coil 33, 39 consists of parallel-guided subconductors arranged in several layers next to one another and/or one on top of the other and electrically insulated from one another. The respective coil 33, 39 has two switching ends via which the coils 33, 39 are combined to form a winding system.
Fig 2 shows an exemplary winding system. The stator comprises two laminated cores 31 lying adjacent to one another on a segment boundary 32, wherein segment-overlapping coils 39 are used, for example in the form of the split coils described in
PCT/EP2 015/07763 9 / 2014P20740WO 3 more detail below. Also provided are coils 33 which are only accommodated in one of the segment laminated cores 1.
The coil segment lying in a groove 34 of the segment laminated core 1 is called the groove side or groove portion 35, the interim section is called a winding head or winding head portion 36. Viewed in the radial direction, two groove sides 35 of different coils 33 lie one on top of the other in each groove 34. The groove side 35 lying in the groove base or in the lower groove half 37 is called the bottom bar, the groove side at the groove outlet or the upper groove half 38 is called the top bar. The groove sides 35 of a groove 34 are typically separated by a separator and the groove 34 is sealed by a wedge.
This briefly-described type of coil is shown in Fig 3 and is known as a two-layer winding, wherein such coils 33 are also called drum coils and, in the present document, as first coils. In this context, the respective coil 33 is embodied such that one of the two groove sides 35 functions as a top bar and the other of the two groove sides 35 functions as a bottom bar, as is also evident in Fig 1 so that the two-layer winding is present in the form of a standard drum coil.
The stator production process includes impregnation of the winding with impregnating resin. During this, the stator and the winding are immersed in an impregnating tank. Due to the spatial limitation on the size of the tank and the need to ensure transportability, stators with a bore diameter that exceeds a critical size are constructed in segments, as is the case, for example with ring motors. During segmented construction, the stator laminated core is produced in the form of annular segments which are assembled at the location
PCT/EP2015/077639 / 2014P20740WO 4 at which the machine is used. The number of segments depends upon the size of the machine, wherein typically four segments are provided. A respective segmented winding system is particularly desirable for stators produced by means of segmented construction. In this context, segmented winding means that that no coils covering more than one segment are used to construct the winding. The segmentation of the winding system presents a technical problem.
To date, the problem has been circumvented in that the coils covering several segments are only assembled at the site of operation of the machine. Such coils often at least partially have an elastic design to facilitate assembly. For example, the bottom bar of the respective coil covering several segments in a stator segment is pre-assembled and the segments are transported to the site of operation of the machine. Finally, during the final assembly, the top bar of the respective coil covering several segments is arranged in the respective adjacent segment in that the respective top bar is folded into the groove provided therefor. Since there is a joint between two adjacent segments, coils covering several segments are also called joint coils or, in the case of an elastic design, split coils. However, assembling coils outside the factory entails a significant amount of extra work and hence is in turn itself a significant problem.
An electrical machine with a segmented stator is disclosed in DE 10 2011 088 660 Al. EP 2 395 632 Al discloses a stator segment for a ring-shaped stator wherein a stator yoke with at least one stator tooth
PCT/EP2015/077639 / 2014P20740WO 5 protruding from the yoke is provided, wherein furthermore at least one stator winding with a first winding section and a second winding section is provided and the first winding section is fixed close to the stator tooth and the winding section is arranged extending freely from the stator segment. DE 10 2007 054 719 Al, DE 10 2010 037 588 A1 and WO 2014/124687 Al disclose further stators for electrical machines .
On the basis of the above-explained stator segments, stators and electrical machines, it is an object of the invention, to provide a stator segment, to develop a stator or an electrical machine of the type mentioned in the introduction such that the above-described disadvantages of the prior art are surmounted.
One way of achieving the object for a stator segment of the type described in the introduction provides that the coils comprise second coils, which each surround the segment laminated core and which each have a second groove portion, a back portion and two radial portions, wherein the back portion of the respective second coil is arranged on the radial outer side of the segment laminated core, wherein the respective, second groove portion is connected to the back portion of the respective second coil on the respective axial end face by means of the respective radial portion, wherein the second groove portion of the respective second coil is arranged in one of the grooves of the respective edge portion.
In addition, the object can be achieved for a stator of the type described in the introduction in that it has at least two stator segments of this kind.
PCT/EP2015/077639 / 2014P20740WO 6 A further way of achieving the object for an electrical machine of the type described in the introduction and finally for a mill or a compressor of the type described in the introduction consists in that the electrical machine has a stator of this kind and/or at least two stator segments of this kind or the mill or the compressor has an electrical machine of this kind.
The first coils are embodied such that the two first groove portions of the respective first coil are accommodated in different grooves. For example, the respective radial portion connecting the two first groove portions of the respective first coil can be embodied bent in order to bridge the distance in the circumferential direction between the two grooves in which the two first groove portions of the respective first coil are arranged. Viewed radially outwardly from the axis, the winding head portion of the respective first coil is hence in particular substantially V-shaped, wherein the respective V is in particular made up of two Z-shaped arcs spanning each other in opposite directions in the circumferential direction. Hence, the outer ribs of the respective Z-shaped arc are substantially parallel to one another and aligned in the axial direction while the two middle ribs of the two Z-shaped arcs are bent in opposite directions to one another in the circumferential direction. As mentioned above, the first coils are also called a two-layer winding, in particular a corded two-layer winding.
In this case, the two first groove portions of the respective first coil can both be arranged in grooves of the central portion, wherein alternatively one of the two first groove portions can be arranged in the central portion and the other
PCT/EP2015/077639 / 2014P20740WO 7 one of the two groove portions of the respective first coil can be arranged in one of the two edge portions.
Also provided are second coils, which are also called toroidal coils and in particular differ from the first coils in that they only have one groove portion, namely the respective second groove portion. This is usually associated with the fact that the respective second coil has a back portion arranged on the radial outer side of the segment laminated core so that the respective second coil surrounds the segment laminated core. Hence, the respective toroidal coil surrounds the segment laminated core in a plane spanned by the axial direction and a radial direction.
In this case, the proposed stator segment or stator is in particular subject to the following considerations.
The winding head does not contribute to the creation of torque. However, it is necessary to connect the forward conductors electrically to the return conductors. If the forward conductor is characterized by a magnetic north pole, the return conductor must be characterized by a magnetic south pole. Otherwise there would be an increase in the current and, at least theoretically, the total torque would be zero.
It is possible completely to dispense with the torque-creating effect of the return conductor. Then, the inactive return conductor has to be returned in a region of the machine cross section to the other side of the machine where it cannot result in the creation of torque. This requirement is met outside the stator yoke if the stator lies outside and surrounds the rotor.
PCT/EP2015/077639 / 2014P20740WO 8
This is in particular achieved by an arrangement of one or more coils arranged in a toroidal shape around the stator yoke or the segment laminated core. This basic winding arrangement is known as a toroidal winding or toroidal coil. It has been investigated with small machines designed as either radial flow machines or axial flow machines and can provide electric power smaller by several orders of magnitude than the proposed stator or the proposed electrical machine. With said small machines, the stator yoke is usually wound directly as is also conventional with toroidal core transformers.
Such small machines are, for example, known from the following: WO 99/019962 Al, US 4 563 606 A, EP 2 017 945 Al, US 4 103 197 A, EP 1 324 472 A2, WO 02/089291 A2, wherein these partially also provide for the encapsulation of the stator, for example with epoxy resin.
No documents from the prior art disclose the production and use of toroidal coils in large machines, i.e. in particular in the case of stator segments, stators or electrical machines with an electric power of at least 1 MW.
The advantage compared to conventional coils used to date in large machines is the simple design of toroidal coils and in particular the use of toroidal coils in order to avoid coils covering several segments. They are, for example, wound about four mandrels arranged in a rectangle.
In particular, when it is not necessary or possible for the rotor to be introduced through the stator bore, it is advantageous to use toroidal coils as this usually requires the yoke to be divided into at least two segments. This is
PCT/EP2015/077639 / 2014P20740WO 9 because toroidal coils cannot usually be inserted in an enclosed stator yoke.
Although the proposed use of toroidal coils has several advantages, it also entails a few disadvantages. For example, although with conventional, two-pole machines the inactive conductor length in the winding head is greater than the active conductor length so that the ratio of the active conductor length to the overall conductor length is about 1.0: 2.2. However, the magnetically inactive conductor component increases further with toroidal coils. The ratio of the active conductor length to the overall conductor length is now about 1.0:2.5 to 1.0:3.0. This results in an increase in the current heat losses. Hence, implementation with a special project is also decisively dependent upon the weighting of the requirements and the actual proportion of the current heat losses in the total losses. A further disadvantage is the enlargement of the standard outer diameter, which is due to the fact that the return conductor is guided along the radial outer side of the segment laminated core. Preferably, during the construction of the region around the stators, care should be taken to ensure that if possible no highly permeable, enclosed paths are created. This would cause a leakage flux to form, which would, in turn result in heating of the structural components and an increase in the load-dependent supplementary losses. Further losses can occur in the case of single-layer windings due to a greater field harmonic component.
Hence, overall, the proposed stator segment has a kind of mixed winding having first coils and second coils. This has the advantage that it enables segmentation of the stator
PCT/EP2015/077639 / 2014P20740WO 10 winding system which is very beneficial for the stator assembly. This enables problematic coil assembly outside the factory to be circumvented.
This is in particular achieved in that coils covering several segments are avoided. For example, the first groove portions of the first coils, which, depending upon the embodiment, can partially achieve a significant extension in the circumferential direction, are each arranged completely in the grooves of a stator segment. In addition to the first coils, which extend toward the central portion of the same stator segment, the second coils are provided in the grooves of the respective edge portion. Since the second coils each only have one second groove portion, a winding is created for the stator segment having no coils covering several segments. For example, the back portion of the respective second coil in this circumferential region can be arranged on the radial outer side of the segment laminated core in which the respective second groove portion is located.
The proposed stator segment or the proposed stator are in particular suitable for large electric machines since they can both be driven with an electric power of at least 1 MW. For example, the stator can have an inside diameter of at least 500 mm or at least 1000 mm. The proposed electrical machine has, for example, a rotor mounted rotatably in the stator, is preferably a rotary machine and can, for example, be embodied as a wind power generator or a drive motor, in particular a ring motor. However, in particular, with the use of the stator in a mill or compressor, the stator inside diameter can be also be more than 3 m or 5 m, wherein the stator can then, for example, be driven with an electric power of at least 10 MW,
PCT/EP2015/077639 / 2014P20740WO 11 sometimes at least 25 MW. For example, a corresponding ring motor can have a stator inside diameter of about 15 m.
In one advantageous embodiment of the invention, at least two adjacent first coils with each of which both first groove portions are arranged in one of the grooves of the central portion offset to one another in the circumferential direction by one groove and are embodied such that they have a substantially identical geometry and in each case one of the two respective first groove portions functions as a top bar and the other of the two respective first groove portions functions as a bottom bar.
Hence, at least two adjacent first coils with which in each case the first groove portion functions as a top bar and the other first groove portion functions as a bottom bar are arranged in the central portion. Often, first coils of this kind are also called standard drum coils. In this case, the at least two adjacent first coils have a substantially identical geometry and are arranged offset to one another in the circumferential direction by one groove. This facilitates a space-saving arrangement of the respective winding head portions, which simultaneously avoided collisions of coils in the winding head.
In a further advantageous embodiment of the invention, the first coils with each of which a first groove portion is arranged in the grooves of the first edge portion or the second edge portion are substantially embodied the same as the first coils with which each of the two first groove portions are arranged in one of the grooves of the central portion.
PCT/EP2015/077639 / 2014P20740WO 12
In order to facilitate a space-saving arrangement of the respective winding head portions and collisions of coils in the winding head, the first coils with each of which a first groove portion is arranged in the grooves of the first edge portion or the second edge portion are substantially embodied the same as the first coils with which each of the two first groove portions are arranged in the grooves of the central portion .
Hence, it is, for example, conceivable for all first coils to be embodied the same regardless of whether the respective first coil is arranged completely in the central portion or partly in the central portion and partly in one of the edge portions. Alternatively, it can also be provided that the only first coils embodied the same are those arranged either completely in the central portion or partly in the central portion and partly in the first edge portion.
In this case, the respective first coil is preferably embodied such that one first groove portion functions as a top bar and the other first groove portion of the respective first coil functions as a bottom bar so that in each a standard drum coil is present. Overall, the first coils can be arranged such that two adjacent first coils are each arranged offset to one another in the circumferential direction by one groove.
In an alternative advantageous embodiment of the invention, the first coils with each of which a first groove portion is arranged in the grooves of the first edge portion or the second edge portion are embodied such that both first groove portions each functions as a top bar.
PCT/EP2015/077639 / 2014P20740WO 13
The first coils with which both first groove portions function either as a top bar or as a bottom bar are also called equally-positioned drum coils. The use of first coils, which are arranged partly in the central portion and partly in the first edge portion or in the second edge portion and the two first groove portions of which function as a top bar enables the use of second coils in the first or second edge portion surrounding the segment laminated core comparatively tightly thus enabling material to be saved and electric power loss to be reduced. This is achieved in that the respective second groove portion functions as a bottom bar thus enabling the respective radial portion to be embodied shorter. This furthermore permits a place-saving arrangement of the respective radial portions and winding head portions, which simultaneously avoids collisions of coils in the winding head.
Advantageously, the other first coils are embodied as standard drum coils so that the respective second groove portions of the second coils arranged in the first edge portion also function as a bottom bar.
However, it is in principle also conceivable for the first coils with which in each case a first groove portion is arranged in the grooves of the first edge portion or the second edge portion to be embodied such that both first groove portions function as a bottom bar.
In a further, alternative advantageous embodiment of the invention, the respective second coil is embodied such that the respective second groove portion functioning as a top bar or as a bottom bar is the one arranged in one of the grooves of the first edge portion or the second edge portion.
PCT/EP2015/077639 / 2014P20740WO 14
Such an embodiment of the respective second coils in particular enables the use of uniform first coils, wherein the first coils are in particular present in the form of standard drum coils with which one first groove portion functions as a top bar and the other first groove portion functions as a bottom bar.
In a further advantageous embodiment of the invention the second coils with a respective second groove portion functioning as a bottom bar are embodied flat in a plane.
Hence, the second coils with a respective second groove portion functioning as a bottom bar can each have comparatively short radial portions so that they surround the segment laminated core comparatively tightly thus enabling material to be saved and electric power loss to be reduced. This furthermore permits a place-saving arrangement of the respective radial portions and winding head portions, wherein simultaneously collisions of coils in the winding head are avoided. In this context, the flat embodiment means that the respective second coil can, for example, be laid flat on an even surface and hence lies in a planar fashion.
In a further, alternative advantageous embodiment of the invention the second coils with a respective second groove portion functioning as a top bar is embodied in a double ν'-shape such that the respective radial portion is angled with respect to the respective back portion and the respective second groove portion.
The respective back portion and the respective groove portion are preferably arranged substantially at the same position in the circumferential direction. The respective V-shaped
PCT/EP2015/077639 / 2014P20740WO 15 embodiment can, for example, be considered to be a bend in the respective radial portion in the circumferential direction with respect to the respective back portion and the respective groove portion. Since both radial portions on both axial end faces are embodied in such a V-shape or bent, when viewed in the radial direction, a double V-shaped embodiment of the respective second coil is provided.
Such an embodiment of the second coils with a respective second groove portion functioning as a top bar keeps space free in the axial extension of the respective second groove portion, which, for example, is available for the winding head portions of the first coils arranged partly in the central portion and partly in the respective edge portion.
In this case, the two radial portions of the respective second coil can point or be bent toward the segment boundary, wherein advantageously second coils with a respective second groove portion embodied or functioning as a bottom bar are used on the respective adjacent edge portion of the adjacent stator segment. Hence, the second coils of the adjacent segment require less space which is available for the second coils of the stator segment in question.
In a further, alternative advantageous embodiment of the invention, the second coils with a respective second groove portion functioning as a top bar are embodied in a Z-shape such that the respective radial portion is bent with respect to the respective back portion and the respective second groove portion.
The respective radial portion is hence embodied substantially Z-shaped, wherein the two outer ribs of the Z are
PCT/EP2015/077639 / 2014P20740WO 16 substantially parallel to one another and hence aligned in the axial direction. The middle rib of the Z is, on the other hand, bent in the circumferential direction thus achieving a type of alternative displacement in the circumferential direction. The double Z-shaped embodiment of the respective second coil when viewed in the radial direction is achieved in that in each case a Z-shaped embodiment is provided for the respective radial portion on the respective axial end face.
In a further advantageous embodiment of the invention, respective adjacent second coils are embodied such that the axial extension of the respective radial portion increases from the segment boundary toward the central portion.
This embodiment of the respective second coils enables material to be saved and electric power loss to be reduced. This is in particular enabled in that the winding head portion of the respective first coil is embodied bent, i.e. substantially V-shaped when viewed radially outwardly from the axis so that the first coils arranged in the respective edge portion, in particular in the vicinity of the segment boundary, require comparatively little space in the axial extension of the respective first groove portions for their respective winding head portion. This enables the axial extension of the respective radial portion of the second coil with a respective second groove portion arranged in a groove in the vicinity of the segment boundary to be embodied as particularly short.
In principle, the first coils require more space from the segment boundary toward the central portion in the axial direction for the respective winding head portion so that the respective second coil is correspondingly embodied such that
PCT/EP2015/077639 / 2014P20740WO 17 the axial extension of the respective radial portion increases from the segment boundary toward the central portion.
In this case, it is in principle possible for the respective second coils to be embodied flat, angled or bent, as explained above .
The following describes and explains the invention in more detail with reference to the exemplary embodiments shown in the figures, which show: FIG 1-3 FIGs 4-6 FIGs 7-8 FIG 9 FIGs 10-12 FIG 13 coil, FIGs 14-16 FIGs 17&18 stator segments and coils according to the prior art, a first and a second exemplary embodiment of the proposed stator segment, a first and a second exemplary embodiment of a second coil, a third and the second exemplary embodiment of the proposed stator segment, a fourth and the second exemplary embodiment of the proposed stator segment, a third exemplary embodiment of a second a fifth and the second exemplary embodiment of the proposed stator segment, and an exemplary embodiment of a first coil.
Figs 1 to 3 show stator segments and coils according to the prior art as already described above.
Figs 4 to 6 show a first and a second exemplary embodiment of the proposed stator segment, wherein Fig 4 depicts a radially outward view, Fig 5 a perspective radially outward view and
PCT/EP2 015/07763 9 / 2014P20740WO 18
Fig 6 a view in the axial direction. In this case, the same reference characters identify the same objects.
Depicted in each case are portions of two adjacent stator segments each having a segment laminated core 1, wherein the two stator segments abut one another on a segment boundary 4. In this case, the respective segment laminated core 1 has a first edge portion 2 and a second edge portion 3 each of which is arranged on a corresponding segment boundary 4 to the respective adjacent stator segment. Furthermore, the respective segment laminated core 1 has a central portion 5, which is arranged between the respective first edge portion 2 and the respective second edge portion 3. In this case, the segment laminated core 1 depicted on the right or left in Figs 4-6 should be considered as belonging to the first or second exemplary embodiment of the proposed stator segment.
The respective stator segment furthermore has a plurality of coils each of which have at least one groove portion and which are explained in the following. The respective segment laminated core 1 has grooves 6, which extend in the axial direction and are radially inwardly open, as indicated in Fig 5. In this case, the grooves 6 are arranged offset to one another in the circumferential direction and embodied such that in each case two groove portions can be arranged therein in the radial direction one on top of the other with the radially inwardly arranged groove portion functioning as a top bar 7 and the radially outwardly arranged groove portion functioning as a bottom bar 8.
Said coils include first coils 9, which each have two first groove portions 10 and two winding head portions 11, wherein the two first groove portions 10 of the respective first coil
PCT/EP2015/077639 / 2014P20740WO 19 9 are connected to one another on the respective axial end face by means of the respective winding head portion 11. In this case, the two first groove portions 10 of the respective first coil 9 are arranged in different grooves 6 which are offset with respect to one another by a number of grooves 6.
In the present exemplary embodiment, for example, six grooves 6 lie between the grooves 6 in which the two first groove portions 10 of a first coil 9 lie. In this case, two first groove portions 10 of different first coils 9 arranged one on top of the other in the radial direction are arranged in the grooves 6 of the central portion 5, while, on the other hand, in each case a first groove portion 10 of one the first coils 9 is arranged in the grooves 6 of the first edge portion 2 or the second edge portion 3.
In this case, the respective first coils 9 are embodied within the scope of the exemplary embodiment such that in each case one of the two first groove portions 10 functions as a top bar 7 and the other of the two first groove portions 10 functions as a bottom bar 8, as is evident from Fig 6 for example.
Said coils furthermore include second coils 12, which each surround the segment laminated core 1 and which have each a second groove portion 13, a back portion 14 and two radial portions 15 as is depicted in more detail in Figs 7 and 8. The respective, second groove portion 13 is connected to the back portion 14 of the respective second coil 12 on the respective axial end face by means of the respective radial portion 15, wherein the back portion 14 of the respective second coil 12 is arranged on the radial outer side of the segment laminated core 1. The second groove portion 13 of the respective second coil 12 is arranged in one of the grooves 6 of the first edge portion 2 or the second edge portion 3. Hence, in each case a
PCT/EP2015/077639 / 2014P20740WO 20 first groove portion 10 of one of the first coils 9 and a second groove portion 13 of one of the second coils 12 is arranged in the grooves 6 of the respective edge portion 2 or 3.
Within the scope of the exemplary embodiment, the respective second coils 12 with a respective second groove portion 13 arranged in the first edge portion 2 are embodied angled and the respective second coils 12 with a respective second groove portion 13 arranged in second edge portion 3 are embodied flat. In this case, the respective second groove portion 13 of the respective angled or flat second coil 12 functions as a top bar 7 or bottom bar 8.
The respective first coils 9 are often also called drum coils, in particular standard drum coils and are also shown by way of example in Figs 1-3 and explained in more detail in the description further above. The respective second coils 12 are also called toroidal coils.
Figs 7 and 8 show a first and a second exemplary embodiment of a second coil 12 such as for example used in the above-explained second and first exemplary embodiment of the proposed stator segment. As already mentioned, the respective second coils 12 are also called toroidal coils.
The respective second coil 12 has a second groove portion 13 and a back portion 14 and two radial portions 15. The respective second coil 12 is inserted into the respective segment laminated core 1 such that the second groove portion 13 is arranged in one of the grooves 6 and the back portion 14 is arranged on the radial outer side of the segment laminated core 1 so that the respective second coil 12 surrounds the
PCT/EP2015/077639 / 2014P20740WO 21 segment laminated core 1. In the case of the respective second coil 12, the second groove portion 13 is connected to the back portion 14 on the respective axial end face by means of the radial portion 15.
In the scope of the exemplary embodiment, the second coils 12 with a respective second groove portion 13 arranged in one of the grooves 6 of the first edge portion 2 or the second edge portion 3 are embodied such that their respective second groove portion 13 functions as a top bar 7 or bottom bar 8.
In this case, the first exemplary embodiment of the second coil 12 according to Fig 7 is embodied flat so that it substantially extends in a plane. The second exemplary embodiment of the second coil 12 according to Fig 8 is embodied in a double V-shape, wherein the radial portion 15 is embodied angled with respect to the back portion 14 and the groove portion 13.
Fig 9 shows a third and the second exemplary embodiment of the proposed stator segment, wherein the view corresponds to that in Fig 4. In this case, the segment laminated core 1 shown on the right or left is intended to belong to the third or second exemplary embodiment of the proposed stator segment.
The difference between the third exemplary embodiment and the first exemplary embodiment consists in the fact that the respective second coil 12 with a respective second groove portion 13 arranged in one of the grooves 6 of the first edge portion 2 is embodied such that the axial extension of the respective radial portion 15 increases from the segment boundary 4 toward the central portion 5.
PCT/EP2015/077639 / 2014P20740WO 22
Figs 9 to 11 show a fourth and the second exemplary embodiment of the proposed stator segment, wherein the respective view corresponds to that in Figs 4 to 6. In this case, the segment laminated core 1 in Figs 9-11 right or left is intended to belong to the fourth or second exemplary embodiment of the proposed stator segment.
The difference between the fourth exemplary embodiment and the first exemplary embodiment consists in the fact that the respective second coil 12 with a respective second groove portion 13 arranged in one of the grooves 6 of the first edge portion 2 is embodied in a Z-shape such that the radial portion 15 is embodied bent with respect to the back portion 14 and the second groove portion 13.
In addition, in this case it can be provided that the axial extension of the respective bent radial portion 15 increases from the segment boundary 4 toward the central portion 5.
Fig 13 shows an exemplary embodiment of a second coil 12 such as that used, for example, in the above-explained fourth exemplary embodiment of the proposed stator segment. As already mentioned, the respective second coils 12 are also called toroidal coils.
According to its third exemplary embodiment, the second coil 12 is embodied in a Z-shape such that the radial portion 15 is embodied bent with respect to the back portion 14 and the second groove portion 13. Viewed radially inwardly or radially outwardly, hence the respective radial portion 15 is substantially Z-shaped, wherein the two outer ribs of the Z are aligned substantially parallel to one another and hence in the axial direction. On the other hand, the middle rib of the
PCT/EP2015/077639 / 2014P20740WO 23 Z is bent in the circumferential direction. Hence, the Z-shaped embodiment of the second coil is achieved in that in each case a Z-shaped embodiment is provided for the respective radial portion 15 on the respective axial end face.
In addition, in this case it can be provided that the axial extension of the bent radial portions 15 for a plurality of second coils 12 increases from the segment boundary 4 toward the central portion 5.
Figs 14 to 16 show a fifth and the second exemplary embodiment of the proposed stator segment, wherein the respective view corresponds to that in Figs 4 to 6. In this case, the segment laminated core 1 depicted on the right or left in Figs 14-16 is intended to belong to the fifth or second exemplary embodiment of the proposed stator segment.
The difference between the fifth exemplary embodiment and the first exemplary embodiment consists in the fact that the respective first coil 9 with a respective first groove portion 10 arranged in one of the grooves 6 of the first edge portion 2 is embodied such that both first groove portions 10 each function as a top bar 7. Such first coils 9 are also called equally-positioned drum coils and are shown in more detail in Figs 17 and 18. A further difference between the fifth exemplary embodiment and the first exemplary embodiment consists in the fact that the respective second coil 12 with a respective second groove portion 13 arranged in one of the grooves 6 of the first edge portion 2 is embodied such that their respective second groove portion 13 functions in each case as a bottom bar 8.
PCT/EP2015/077639 / 2014P20740WO 24
Figs 17 and 18 show an exemplary embodiment of a first coil 9, such as is, for example, used in the above-explained fifth exemplary embodiment of the proposed stator segment. As already mentioned, such first coils 9 are also called equally-positioned drum coils.
The first coil 9 according to the exemplary embodiment is embodied such that the two first groove portions 10 each function as a top bar 7.
In summary, the invention relates to a stator segment for a hollow cylinder-shaped, segmented stator of an electrical machine, wherein the stator segment has a segment laminated core having a first edge portion and a second edge portion, which are each arranged on a segment boundary to the respective adjacent stator segment and a central portion, which is arranged between the first edge portion and the second edge portion, and coils which each have at least one groove portion, wherein the segment laminated core has radially inwardly open grooves extending in the axial direction, which are arranged offset to one another in the circumferential direction, wherein the respective groove is embodied such that two groove portions can be arranged therein in the radial direction one on top of the other with the radially inwardly arranged groove portion functioning as a top bar and the radially outwardly arranged groove portion functioning as a bottom bar, wherein the coils comprise first coils, which each have two first groove portions and two winding head portions, wherein the two first groove portions of the respective first coil are connected to one another on the respective axial end face by means of the respective winding head portion, wherein the two first groove portions of the respective first coil are arranged in different grooves,
PCT/EP2015/077639 / 2014P20740WO 25 which are offset with respect to one another by a number of grooves, wherein in each case two first groove portions of different first coils are arranged one on top of the other in the radial direction in the grooves of the central portion, wherein in each case a first groove portion of one of the first coils is arranged in the grooves of the respective edge portion .
The invention also relates to a hollow cylinder-shaped, segmented stator for an electrical machine having at least two such stator segments. The invention further relates to such an electrical machine and finally a mill or a compressor having such an electrical machine.
In order to develop a stator segment, a stator or an electrical machine of the type described in the introduction such that the above-described disadvantages of the prior art are overcome it is proposed that the coils comprise second coils, which each surround the segment laminated core and which each comprise a second groove portion, a back portion and two radial portions, wherein the back portion of the respective second coil is arranged on the radial outer side of the segment laminated core, wherein the respective, second groove portion on the respective axial end face is connected to the back portion of the respective second coil by means of the respective radial portion, wherein the second groove portion of the respective second coil is arranged in one of the grooves of the respective edge portion.
Also proposed is a stator having at least two such stator segments. Also proposed is an electrical machine having such a stator and/or at least two such stator segments or the mill or the compressor having such an electrical machine.
Claims (12)
- Claims1. A stator segment for a hollow cylinder-shaped, segmented stator of an electrical machine, wherein the stator segment has : - a segment laminated core (1) having a first edge portion (2) and a second edge portion (3), which are each arranged on a segment boundary (4) to the respective adjacent stator segment, and a central portion (5), which is arranged between the first edge portion (2) and the second edge portion (3), and - coils each having at least one groove portion, wherein the segment laminated core (1) has radially inwardly open grooves and radially inwardly open grooves (6) extending in the axial direction arranged in the circumferential direction offset to one another, wherein the respective groove (6) is embodied such that two groove portions can be arranged therein one on top of the other in the radial direction with the radially inwardly arranged groove portion functioning as a top bar (7) and the radially outwardly arranged groove portion functions as a bottom bar (8), wherein the coils comprise first coils (9) each having two first groove portions (10) and two winding head portions (11), wherein the two first groove portions (10) of the respective first coil (9) are connected to one another on the respective axial end face by means of the respective winding head portion (11) , wherein the two first groove portions (10) of the respective first coil (9) are arranged in different grooves (6), which are offset with respect to one another by a number of grooves (6) , wherein in each case two first groove portions (10) of different first coils (9) arranged one on top of the other in the radial direction are arranged in the grooves (6) of the central portion (5), wherein in each case a first groove portion (10) of one of the first coils (9) is arranged in the grooves (6) of the respective edge portion (2, 3), characterized in that the coils comprise second coils (12) each of which surrounds the segment laminated core (1) and which each have a second groove portion (13), a back portion (14) and two radial portions (15) , wherein the back portion (14) of the respective second coil (12) is arranged on the radial outer side of the segment laminated core (1), wherein the respective second groove portion (13) is connected to the back portion (14) on the respective axial end face of the respective second coil (12) by means of the respective radial portion (15), wherein the second groove portion (13) of the respective second coil (12) is arranged in one of the grooves (6) of the respective edge portion (2, 3).
- 2. The stator segment as claimed in claim 1, wherein at least two adjacent first coils (9) with each of which both first groove portions (10) are arranged in one of the grooves (6) of the central portion (5) are each arranged offset to one another in the circumferential direction (6) by one groove and are embodied such that - they have a substantially identical geometry and - in each case one of the two respective first groove portions (10) functions as a top bar (7) and the other of the two respective first groove portions (10) functions as a bottom bar (8) .
- 3. The stator segment as claimed in one of the preceding claims, wherein the first coils (9) with each of which a first groove portion (10) is arranged in the grooves (6) of the first edge portion (2) or the second edge portion (3) is substantially embodied similarly to the first coils (9) with each of which both first groove portions (10) are arranged in one of the grooves (6) of the central portion (5).
- 4. The stator segment as claimed in one of claims 1-2, wherein the first coils (9) with each of which a first groove portion (10) is arranged in the grooves (6) of the first edge portion (2) or the second edge portion (3) are embodied such that both first groove portions (10) in each case function as a top bar (7).
- 5. The stator segment as claimed in one of claims 1-3, wherein the respective second coil (12) is embodied such that the respective second groove portion (13) functions as a top bar (7) or as a bottom bar (8), which is arranged in one of the grooves (6) of the first edge portion (2) or the second edge portion (3).
- 6. The stator segment as claimed in one of the preceding claims, wherein the second coils (12) with a respective second groove portion (13) functioning as a bottom bar (8) are embodied flat in a plane.
- 7. The stator segment as claimed in one of claims 1-3, wherein the second coils (12) with a respective second groove portion (13) functioning as a top bar (7) are embodied in a double V-shape such that the respective radial portion (15) is angled with respect to the respective back portion (14) and the respective second groove portion (13).
- 8. The stator segment as claimed in one of claims 1-3, wherein the second coils (12) with which the respective second groove portion (13) functions as a top bar (7) are embodied in a Z-shape such that the respective radial portion (15) is bent with respect to the respective back portion (14) and the respective second groove portion (13).
- 9. The stator segment as claimed in claim 7 or 8, wherein respective adjacent second coils (12) are embodied such that the axial extension of the respective radial portion (15) increases from the segment boundary (4) toward the central portion (5).
- 10. A hollow cylinder-shaped segmented stator for an electrical machine having at least two stator segments as claimed in one of the preceding claims.
- 11. An electrical machine having a stator as claimed in claim 10 and/or at least two stator segments as claimed in one of claims 1-9.
- 12. A mill or compressor having an electrical machine as claimed in claim 11.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP14198841.0A EP3035500A1 (en) | 2014-12-18 | 2014-12-18 | Stator segment for a hollow cylindrical segmented stator of an electric machine |
| EP14198841.0 | 2014-12-18 | ||
| PCT/EP2015/077639 WO2016096348A1 (en) | 2014-12-18 | 2015-11-25 | Stator segment for a hollow cylinder-shaped, segmented stator of an electrical machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| AU2015363518A1 true AU2015363518A1 (en) | 2017-04-27 |
| AU2015363518B2 AU2015363518B2 (en) | 2018-04-12 |
Family
ID=52144450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2015363518A Ceased AU2015363518B2 (en) | 2014-12-18 | 2015-11-25 | Stator segment for a hollow cylinder-shaped, segmented stator of an electrical machine |
Country Status (5)
| Country | Link |
|---|---|
| EP (2) | EP3035500A1 (en) |
| AU (1) | AU2015363518B2 (en) |
| CL (1) | CL2017001586A1 (en) |
| PE (1) | PE20171527A1 (en) |
| WO (1) | WO2016096348A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3429063A1 (en) | 2017-07-14 | 2019-01-16 | Siemens Aktiengesellschaft | Single layer stand winding for electrical machines |
| GB2609640A (en) * | 2021-08-11 | 2023-02-15 | Saietta Group PLC | Radial flux electrical machine |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2500191A (en) * | 1945-11-19 | 1950-03-14 | Lee Royal | Compensated electric motor |
| JPS51118007U (en) | 1975-03-19 | 1976-09-25 | ||
| JPS5914336A (en) | 1982-07-14 | 1984-01-25 | Hitachi Ltd | Rotary electric machine |
| DE4404585C2 (en) * | 1994-02-12 | 1998-04-09 | Sen Rainer Born | Stator with toroidal coils for electrical machines |
| WO1999019962A1 (en) | 1997-10-16 | 1999-04-22 | Omnidyne Inc. | Generators and transformers with toroidally wound stator winding |
| EP1459425B1 (en) | 2001-04-30 | 2010-07-07 | Schwericke, Florian Christoph | Electric synchronous machine comprising a toroidal winding |
| CN1133260C (en) | 2001-12-25 | 2003-12-31 | 江西喜泰电机有限公司 | Electric machine with ring windings on internal and external rotors without slots |
| CN101461120B (en) | 2006-06-01 | 2011-06-01 | 松下电器产业株式会社 | Motor stator and mold motor |
| DE102007054719A1 (en) * | 2007-06-28 | 2009-01-08 | Universität Bremen | Electrical induction machine e.g. offshore-wind turbine, for e.g. wind power station, has electrical conductor of winding head resting in winding segments, where electrical conductor is connected with coil sides of coil of winding segments |
| EP2395632A1 (en) * | 2010-06-10 | 2011-12-14 | Siemens Aktiengesellschaft | Stator segment unit adapted to build a ring-shaped stator when assembled |
| DE102010037588A1 (en) * | 2010-09-16 | 2012-03-22 | Lloyd Dynamowerke Gmbh & Co. Kg | Segment for use in stator, for electrical machine, has grooves for receiving array of coils arranged in first and second layers, where sides of coil in another array of coils are arranged in third layer |
| DE102011088660A1 (en) | 2011-12-15 | 2013-06-20 | Siemens Aktiengesellschaft | Electric machine with housing and stator segments |
| WO2014124687A1 (en) * | 2013-02-15 | 2014-08-21 | Siemens Aktiengesellschaft | Electric machine having a segmented stator and two-layer winding |
-
2014
- 2014-12-18 EP EP14198841.0A patent/EP3035500A1/en not_active Withdrawn
-
2015
- 2015-11-25 AU AU2015363518A patent/AU2015363518B2/en not_active Ceased
- 2015-11-25 EP EP15802038.8A patent/EP3207620B1/en not_active Not-in-force
- 2015-11-25 WO PCT/EP2015/077639 patent/WO2016096348A1/en active Application Filing
- 2015-11-25 PE PE2017000787A patent/PE20171527A1/en unknown
-
2017
- 2017-06-16 CL CL2017001586A patent/CL2017001586A1/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU2015363518B2 (en) | 2018-04-12 |
| EP3035500A1 (en) | 2016-06-22 |
| WO2016096348A1 (en) | 2016-06-23 |
| CL2017001586A1 (en) | 2018-03-02 |
| EP3207620B1 (en) | 2018-11-21 |
| PE20171527A1 (en) | 2017-10-20 |
| EP3207620A1 (en) | 2017-08-23 |
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Legal Events
| Date | Code | Title | Description |
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| FGA | Letters patent sealed or granted (standard patent) | ||
| MK14 | Patent ceased section 143(a) (annual fees not paid) or expired |